Monogram Range Error Code F3: Sensor Replacement vs.... | appliancefaults.com

Technical Background:

The F3 error code on a Monogram range indicates a problem with the oven temperature sensor circuit. The Main Control Unit (MCU) monitors the resistance of the RTD sensor to determine the oven temperature. If the MCU detects an out-of-range resistance, or an open/shorted circuit, it triggers the F3 error. The MCU applies a low DC voltage (typically 5V DC) across the sensor, and the current flow depends on the sensor's resistance.

Symptoms:

The homeowner reports that the oven is displaying an F3 error code on the control panel. The oven may not heat properly or may overheat.

Possible Causes:

Faulty oven temperature sensor (RTD).
Wiring harness damage or loose connections.
Control board malfunction.
Sensor installed too far into the oven cavity.
Excessive oven temperatures during self-clean cycles impacting sensor life.

Solution:

1

Disconnect power to the range at the breaker panel. Lock Out/Tag Out (LOTO).
2

Locate the oven temperature sensor (RTD) inside the oven cavity, usually at the rear.
3

Using a 1/4-inch nut driver, remove the sensor mounting screws.
4

Disconnect the sensor wiring connector from the range's wiring harness.
5

Using a multimeter, measure the sensor's resistance. A typical RTD sensor should read around 1080 ohms at room temperature (70-75°F). Refer to the service manual for precise values.
6

If the sensor resistance is outside the specified range, replace the sensor.
7

Inspect the wiring harness and connector for damage, corrosion, or loose connections. Repair or replace as needed. Ensure a tight, secure connection when reconnecting.

Safety Warning:

Always disconnect power to the range at the breaker panel before performing any repairs. High voltage is present inside the range, which can cause serious injury or death. Verify the unit is de-energized with a multimeter before proceeding. Follow Lock Out/Tag Out (LOTO) procedures.

Prevention:

Avoid using excessively high temperatures during self-clean cycles. Regularly inspect the oven temperature sensor and wiring for damage.

Expert Tip:

After replacing the sensor, run the oven through a bake cycle and monitor the temperature with an external oven thermometer to ensure accurate temperature control. You can also enter the service mode by pressing and holding the Bake and Broil buttons simultaneously for 5 seconds. This allows for calibration and advanced diagnostics.

Frequently Asked Questions

•What is the correct resistance value for the RTD sensor at 350 degrees Fahrenheit?

Refer to the appliance service manual for a resistance chart related to the oven temperature. The resistance should increase as the temperature increases.

•How do I check the wiring harness for continuity?

Use a multimeter set to the continuity setting. With the range unplugged, check for continuity between the sensor connector and the control board connector. Wiggle the harness to check for intermittent breaks.

•If the sensor and wiring are good, what's the next most likely cause of the F3 error?

If the sensor and wiring are verified as good, the most likely cause is a faulty control board. The board might not be interpreting the sensor's signal correctly. Replacement of the board is usually the next step.

Monogram Range Error Code F3: Sensor Replacement vs. Wiring Repair

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance value for the RTD sensor at 350 degrees Fahrenheit?

•How do I check the wiring harness for continuity?

•If the sensor and wiring are good, what's the next most likely cause of the F3 error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: